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All about waves
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Slide 1

Waves

Waves

This PowerPoint Presentation is intended for use during lessons to match the content of Waves and Our Universe - Nelson

Either for initial teaching

Or for summary and revision

Slide 2

Oscillations

Oscillations

Going round in circles

Circular Motion Calculations

Circular Motion under gravity

Periodic Motion

SHM

Oscillations and Circular Motion

Experimental study of SHM

Energy of an oscillator

Mechanical Resonance

Slide 3

Waves

Waves

Travelling waves

Transverse and Longitudinal waves

Wave speed, wavelength and frequency

Bending Rays

Superposition

Two-source superposition

Superposition of light

Stationary waves

Slide 4

Going round in circles

Going round in circles

Speed may be constant

But direction is continually changing

Therefore velocity is continually changing

Hence acceleration takes place

Slide 5

Centripetal Acceleration

Centripetal Acceleration

Change in velocity is towards the centre

Therefore the acceleration is towards the centre

This is called centripetal acceleration

Slide 6

Centripetal Force

Centripetal Force

Acceleration is caused by Force (F=ma)

Force must be in the same direction as acceleration

Centripetal Force acts towards the centre of the circle

CPforce is provided by some external force eg friction

Slide 7

Examples of Centripetal Force

Examples of Centripetal Force

Friction

Tension in string

Gravitational pull

Friction

Tension

Weight

velocity

velocity

Slide 8

Centripetal Force 2

Centripetal Force 2

What provides the cpforce in each case ?

Slide 9

Centripetal force 3

Centripetal force 3

Slide 10

Circular Motion Calculations

Circular Motion Calculations

Centripetal acceleration

Centripetal force

Slide 11

Period and Frequency

Period and Frequency

The Period (T) of a body travelling in a circle at constant speed is time taken to complete one revolution - measured in seconds

Frequency (f) is the number of revolutions per second measured in Hz

T = 1 / f f = 1 / T

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